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Stock-Based Compensation (Stock Units Rollforward) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
RSUs |  |  |  |
Stock Units [Roll Forward] |  |  |  |
Outstanding at December 31, 2019 |  | 1,716,445 |  |
Granted |  | 724,319 | 679,601 | 465,378
Vested and distributed |  | (323,818) |  |
Forfeited |  | (66,861) |  |
Outstanding at December 31, 2020 |  | 2,050,085 | 1,716,445 |
Vested and deferred RSUs related to deferred compensation for non-employee directors | [1] | 613,853 |  |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |
Outstanding at December 31, 2019, Weighted Average Grant Date Fair Value |  | $ 10.53 |  |
Granted, Weighted Average Grant Date Fair Value |  | 7.92 | $ 8.74 | $ 12.71
Vested and Distributed, Weighted Average Grant Date Fair Value |  | 12.49 |  |
Forfeited, Weighted Average Grant Date Fair Value |  | 10.20 |  |
Outstanding at December 31, 2020, Weighted Average Grant Date Fair Value |  | 9.31 | $ 10.53 |
Weighted Average Grant Date Fair Value of Vested and Deferred RSUs |  | $ 8.82 |  |
PSUs |  |  |  |
Stock Units [Roll Forward] |  |  |  |
Outstanding at December 31, 2019 |  | 1,021,543 |  |
Granted |  | 939,529 | 895,389 | 747,996
Vested and distributed |  | (377,073) | (1,059,825) | (1,327,613)
Forfeited |  | (67,145) |  |
Other - decrease due to performance of PSUs |  | (1,516,854) |  |
Outstanding at December 31, 2020 |  | 0 | 1,021,543 |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |
Outstanding at December 31, 2019, Weighted Average Grant Date Fair Value |  | $ 9.98 |  |
Granted, Weighted Average Grant Date Fair Value |  | 8.25 | $ 8.35 | $ 12.82
Vested and Distributed, Weighted Average Grant Date Fair Value |  | 12.75 |  |
Forfeited, Weighted Average Grant Date Fair Value |  | 8.56 |  |
Other decrease due to performance of PSU's, Weighted Average Grant Date Fair Value |  | 8.28 |  |
Outstanding at December 31, 2020, Weighted Average Grant Date Fair Value |  | $ 0 | $ 9.98 |
[1] | Included in outstanding at December 31, 2020. Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors.

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